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// -*- mode: c++; c-basic-offset: 2; -*-
#include "common.hh"
#include <algorithm>
#include <cerrno>
#include <limits>
#include <unistd.h>
#include "io.hh"
namespace io {
ssize_t read(int fd, void* buf, size_t max) {
while (true) {
ssize_t ret = ::read(fd, buf, max);
if (ret != -1 || errno != EINTR) return ret;
}
}
ssize_t write(int fd, void const* buf, size_t max) {
while (true) {
ssize_t ret = ::write(fd, buf, max);
if (ret != -1 || errno != EINTR) return ret;
}
}
bool read_all(int fd, void* buf, size_t size) {
auto data = reinterpret_cast<char*>(buf);
auto end = data + size;
while (data < end) {
ssize_t ret = ::read(fd, data, std::min(
std::numeric_limits<ssize_t>::max(), end - data));
if (ret < 0) {
if (errno == EINTR) continue;
return false;
}
if (ret == 0) return false;
data += ret;
}
return true;
}
bool write_all(int fd, void const* buf, size_t size) {
auto data = reinterpret_cast<char const*>(buf);
auto end = data + size;
while (data < end) {
ssize_t ret = ::write(fd, data, std::min(
std::numeric_limits<ssize_t>::max(), end - data));
if (ret < 0) {
if (errno == EINTR) continue;
return false;
}
if (ret == 0) return false;
data += ret;
}
return true;
}
bool auto_fd::reset() {
if (fd_ >= 0) {
auto tmp = fd_;
fd_ = -1;
return close(tmp) != 0;
}
return true;
}
void auto_pipe::reset() {
if (read_ >= 0) {
assert(write_ >= 0);
close(read_);
close(write_);
read_ = -1;
write_ = -1;
}
}
bool auto_pipe::open() {
reset();
int fd[2];
if (pipe(fd) != 0) {
return false;
}
read_ = fd[0];
write_ = fd[1];
return true;
}
} // namespace io
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